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Simplifying 3x + -12 + 9x = 72 Reorder the terms: -12 + 3x + 9x = 72 Combine like terms: 3x + 9x = 12x -12 + 12x = 72 Solving -12 + 12x = 72 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 12x = 72 + 12 Combine like terms: -12 + 12 = 0 0 + 12x = 72 + 12 12x = 72 + 12 Combine like terms: 72 + 12 = 84 12x = 84 Divide each side by '12'. x = 7 Simplifying x = 7
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